JPH05205957A - Electromagnetic equipment - Google Patents

Abstract

PURPOSE:To enable a coil to be lessened in external dimension and weight and a thermosensitive protection device to be easily mounted by a method wherein a cutout is provided to a part of a coil bobbin located between the coil and an iron core, and the thermosensitive protection device is provided to the cutout concerned. CONSTITUTION:A coil bobbin 11 is equipped with a coil-wound part 12 and flanges 13 and 14 provided protruding outwards vertically from the lengthwise ends of the coil-wound part 12, and a cutout 21 is provided to a part of the coil-wound part 12, a coil wire is wounded on the coil-wound part 12 to form a coil 31, the coil 31 a center leg iron core 41 is inserted into the center hollow of the coil 41 and the coil bobbin 11. A thermosensitive protection device 51 is positioned at the cutout 21 of the coil-wound part 12 and inserted in a gap between the coil 31 and the center leg iron core 41. By this setup, a coil can be lessened in size and weight, and a thermosensitive protection device can easily be mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device equipped with a heat protection device.

[0002]

2. Description of the Related Art Heretofore, there has been known an electromagnetic device equipped with a heat-sensitive protection device in order to protect from temperature rise and rare short circuit at the time of abnormality or at the end of life. An electromagnetic device equipped with this heat-sensitive protection device is, for example, Jikken Sho 6
The configuration described in Japanese Patent Publication No. 0-15311 is known. The structure disclosed in Japanese Utility Model Publication No. 60-15311 has a heat-sensitive protective device attached to the outside of the coil.
That is, the heat-sensitive protective device is fixed on the upper surface of the iron core in close contact with the side surface of the coil.

However, according to the electromagnetic device disclosed in Japanese Utility Model Publication No. 60-15311, a member such as a tape for fixing the heat-sensitive protective device is required. Further, since only one side surface of the heat-sensitive protection device is in contact with the coil, heat conduction from the coil to the heat-sensitive protection device is slow. Therefore, when the temperature of the coil rapidly rises due to a rare short circuit or the like, the heat rise is not immediately transmitted to the heat-sensitive protection device, and the heat response of the heat-sensitive protection device deteriorates.

Further, the structure described in Japanese Utility Model Publication No. 55-22750 is also known. This real public Sho 55-2
The configuration described in Japanese Patent No. 2750 is a configuration in which a mounting body is attached to one outer surface of a coil bobbin, a heat-sensitive protective device is incorporated in the mounting body, and then a coil wire is wound.

However, according to the electromagnetic device described in Japanese Utility Model Publication No. 55-22750, only a part of one outer surface of the coil bobbin bulges out, so that it takes a lot of time to wind the coil wire. There is a problem that the outer shape becomes large.

Further, a structure is known in which a space is provided between the coil and the central leg iron core, and the heat-sensitive protection device is inserted into this space.

However, according to this electromagnetic device, since an extra space is provided between the coil and the central leg iron core, there is a problem that the outer shape of the coil becomes large.

[0008]

As described above, in the electromagnetic device disclosed in Japanese Utility Model Publication No. 60-15311, it takes a lot of time to install the heat-sensitive protective device, and the thermal responsiveness of the heat-sensitive protective device is poor. There is a problem
The electromagnetic device described in Japanese Patent Publication No. 750 has a problem that it takes a lot of time to wind the coil wire and the outer shape of the coil becomes large. Further, another conventional electromagnetic device has a larger outer shape of the coil. I have a problem.

The present invention has been made in view of the above problems, and provides an electromagnetic device in which the outer shape of the coil is reduced in size and weight, the work of mounting the heat-sensitive protection device is simple, and the thermal response of the heat-sensitive protection device is improved. The purpose is to

[0010]

An electromagnetic device of the present invention is an electromagnetic device comprising a tubular coil bobbin around which a coil is wound, and an iron core mounted in the coil bobbin. A notch portion is formed in a part located between the iron cores, and a heat-sensitive protection device is arranged in the notch portion.

[0011]

In the electromagnetic device of the present invention, a notch portion is formed in a part between the coil of the coil bobbin and the iron core, and the heat-sensitive protective device is arranged in the notch portion. Since it is located between them, the outer shape of the coil does not become large due to the thickness of the heat-sensitive protection device as in the conventional case, and the outer shape of the coil is reduced in size and weight. Further, since the mounting member of the heat-sensitive protective device is not required and the heat-sensitive protective device may be arranged in the cutout portion, the work of mounting the heat-sensitive protective device is simple. Furthermore, since the thermal protection device is in direct contact with both the coil and the iron core, the thermal response of the thermal protection device is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electromagnetic device of the present invention will be described below with reference to a discharge lamp ballast shown in the drawings.

In FIGS. 1 to 5, reference numeral 11 denotes a coil bobbin, which is integrally molded of synthetic resin or the like, and has a substantially rectangular tube-shaped coil winding portion 12 and both end portions in the longitudinal direction of the coil winding portion 12. It is composed of collar portions 13 and 14 which are vertically projected from the outside to the outside. This coil bobbin
A coil wire (not shown) is wound around the coil winding portion 12 of 11 to wind the coil 31. A plurality of terminals 15 are arranged on the flange 13 at one end of the coil bobbin 11, and each end of the coil wire is electrically connected to the terminal 15.

A notch 21 is provided in a part of the coil winding portion 12 of the coil bobbin 11. The notch 21 is a coil winding portion of the coil bobbin 11 as shown in FIGS.
12 is formed along the axial direction of the coil bobbin 11 at the center of one side surface thereof, and the notch 21 is provided between the collar portion 13 and the collar portions 13 and 14 as shown in FIGS. 1, 3 and 5. A little from the center
It is formed up to the 14th side.

Further, the iron core 40 includes a central leg iron core 41 and a side leg iron core 42.
It consists of and. This central leg iron core 41 has a coil 31
Also, the coil bobbin 11 is fitted in a space formed inside the coil bobbin 11. On the other hand, the pair of side leg cores 42 are arranged on both outer sides of the coil 31 and the coil bobbin 11, and combined with the central leg core 41 to form the core 40.

Then, the heat-sensitive protective device 51 is attached to the coil winding portion 12
The heat-sensitive protection device 51 is located between the coil 31 and the center leg core 41, and is located in the notch 21. Further, the terminal 52 of the heat protection device 51 is electrically connected to the terminal 15.

According to the electromagnetic device of this embodiment, the heat-sensitive protective device 51 is located in the notch 21 of the coil winding portion 12,
Since the heat-sensitive protection device 51 is inserted between the coil 31 and the center leg iron core 41, the thickness of the heat-sensitive protection device 51 can be absorbed, and the external size of the coil 31 does not change when the heat-sensitive protection device 51 is attached. Therefore, the amount of coil wire used can be saved, which is economical, and the outer shape of the coil 31 can be reduced in size and weight. Also,
When mounting the heat-sensitive protective device 51, cut the heat-sensitive protective device 51
Since it is only necessary to position it at position 21 and insert it between the coil 31 and the central leg iron core 41, the heat-sensitive protection device 51 that was previously required
No mounting member is required, and the work of mounting the heat-sensitive protection device 51 is simplified. Furthermore, since the outer side surface and the inner side surface of the heat-sensitive protection device 51 are in direct contact with the coil 31 and the central leg iron core 41, respectively, the thermal response characteristics of the heat-sensitive protection device 51 are improved.

The shape of the cutout portion 21 is not limited to that of this embodiment, and the cutout portion 21 may be connected to the flange portion 13 to the flange portion 14 as shown in FIG. 6, for example. In this case, it is suitable to insert the heat-sensitive protection device 51 having a larger longitudinal direction than the configuration shown in FIGS. 1, 3, and 5.

Further, regarding the shape of the coil winding portion 12,
As shown in FIG. 7, one outer surface of the coil winding portion 12 may be a tapered surface that becomes thicker from each end toward the central notch 21 side, and the notch 21 may be thickened. .. In this case, it is preferable to insert the protective device 51 having a larger thickness than that of the configuration shown in FIGS. 1 to 5.

Further, as shown in FIG. 8, like the coil winding portion 12 of FIG. 7, a cutout portion on one outer side surface of the coil winding portion 12 is formed.
21 side is formed thick, the side facing the coil 31 of each thick side end of the coil winding portion 12 is continuous to form a thin continuous portion 61 of the coil winding portion 12, The opening of the notch 21 may be formed only on the side of the central leg core 41.

Alternatively, as shown in FIG. 9, the thin-walled continuous portion 62 of the coil winding portion 12 is formed by connecting the thick side end portions of the coil winding portion 12 opposite to the central leg iron core 31. And notch
The opening 21 may be formed only on the coil 31 side.

[0022]

According to the electromagnetic device of the present invention, a notch is formed in a part between the coil and the iron core of the coil bobbin, and the heat-sensitive protection device is arranged in this notch, and the heat-sensitive protection device is provided with the coil and the central leg. Since it is located between the iron core, the outer shape of the coil does not become large due to the thickness of the heat-sensitive protective device unlike the conventional case,
The outer shape of the coil can be reduced in size and weight. Further, since the mounting member for the heat-sensitive protective device is not required and the heat-sensitive protective device may be arranged in the cutout portion, the work for mounting the heat-sensitive protective device can be simplified. Furthermore, since the thermal protection device is in direct contact with the coil and the central leg iron core, the thermal response characteristics of the thermal protection device can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an electromagnetic device of the present invention as seen from a side surface.

FIG. 2 is a front sectional view showing an embodiment of the same electromagnetic device.

FIG. 3 is a plan view showing an embodiment of a coil bobbin of the same electromagnetic device.

FIG. 4 is a front view showing an embodiment of the same coil bobbin.

FIG. 5 is a side sectional view showing an embodiment of the same coil bobbin.

FIG. 6 is a plan view showing another embodiment of the same coil bobbin.

FIG. 7 is a front sectional view showing another embodiment of the coil bobbin of the same.

FIG. 8 is a cross-sectional view showing another embodiment of the same coil bobbin as seen from the front.

FIG. 9 is a front sectional view showing another embodiment of the coil bobbin of the same.

[Explanation of symbols]

 11 Coil bobbin 21 Notch 31 Coil 40 Iron core 51 Thermal protector

Claims (1)

[Claims] 1. An electromagnetic device comprising a tubular coil bobbin around which a coil is wound, and an iron core mounted in the coil bobbin, wherein a notch is provided in a part of the coil bobbin located between the coil and the iron core. And a heat-sensitive protection device is provided in the cutout portion.